Tennant appeared in the episode 'Liberty' of "The Romantics" and in the TV film "The Chatterley Affair".

He played a barrister in the miniseries "The Escape Artist", for which he won a BAFTA Scotland Award for best actor.

Tennant portrayed the mind-controlling villain Kilgrave in Netflix’s Marvel series "Jessica Jones".

He starred alongside Olivia Colman in the ITV series "Broadchurch", playing Detective Inspector Alec Hardy.